Slip form paver



June 30, 1970 J. E. KESS EL SLIP FORM PAVER Filed April 4, 1.968

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3,517,590 SLIP FORM PAVER John E. Kessel, 503 E. 2nd, Canton, S. Dak. 57013 Filed Apr. 4, 1968, Ser. No. 718,816

Int. Cl. E01c 19/48 US. Cl. 94-46 2 Claims ABSTRACT OF THE DISCLOSURE A slip form paver having diagonal side forms which may be adjustable, thereby providing a paver which can turn a relatively clean radius. The side form is manually adjustable, but might also be adjustable by power means if desired.

This invention pertains to slip form pavers and more particularly to a small slip form paver adaptable to use for city streets, driveways and the like. The invention is particularly concerned with the ability of such a device to pave around a curve, or to pave varying widths of slab.

Slip form pavers for the laying of a slab of portland cement concrete for highway purposes are not new. Such pavers have been in use for several years on the larger paving projects for principal highways and the like. However, such pavers in small sizes adapted for use on city streets, driveways, etc. are not common.

One problem encountered in the use of such pavers on city streets is that of turning a radius. With the normal pavers, the trailing ends of the forms swing to the outside of the curve causing a piling up of the concrete on the inside of the curve and a failure to deliver an adequate amountin effect a cavitation-on the outside of the curve. The piling up is not serious. A little trowelling or often the normal slump of the concrete will solve that problem. However, the cavitation is more serious, requiring addition of concrete and trowelling or screening to bring the surface up to the proper level.

By my invention, I provide a device which I have discovered will avoid the problem of cavitation on the outside of curves of fairly small radius so that a slip form paver can be used on city streets as well as on rural highways. Also the paver is adaptable for use in laying pavement slabs of varying widths.

A more complete understanding of my invention in its embodiment may be had from a study of the following specification and the figures in which:

FIG. 1 is a top plan view of one side of a paver showing my invention as applied thereto.

FIG. 2 is an elevational view to an enlarged scale showing one end of the slip form and its attaching means.

FIG. 3 is a detailed end view of the slip form to a further enlarged scale.

Briefly my invention comprises a slip form paver having two side forms which form the edges of the concrete slab to be laid down. These edges are adjustable to a slightly diagonal position so that the trailing end particularly of the form on the outside of the curve will be closed in to hold concrete up to its full depth in the slab as the diagonal form follows around the outside of a curve.

More specifically and referring to the drawings, I envision my device attached to a slip form paver mounted on crawler treads 10. These treads carry the paver which includes a hopper 11 into which cement is poured and from which it is deposited onto the road bed. This hopper is mounted on a framework or conveyance means which includes a front member 12 and a rear member 13. Much of the detail of the paver is omitted from the figures for the sake of clarity in describing the particulars of my invention.

The edges of the concrete slab to be laid by the paver are defined and limited by substantially flat side members United States Patent 3,517,590 Patented June 30, 1970 "Ice or side forms 15 carried below the hopper and utilized to form the edge of the slab. They may either be fiat so as to form a vertical edge, or may be formed as shown in FIG. 3 to provide a key against which and around which an adjacent slab may be laid to provide interlocking between the slabs.

By my invention,.I provide for an adjustable mounting of these side forms 15 so that they may be either adjusted uniformly, or independently and therefore differentially. This is done by providing long screw threaded rods 16 rotatably journalled in brackets 17 mounted on both the front and rear members of the frame. These rods may be provided with hand cranks 18 or be controlled by powered means adapted to turn the rods. It will be obvious that hydraulic means or the like may be used to actuate the adjustment.

The side form 15 may be provided with a backbone 20 welded to its side for the purpose of stiffening the form. However, the use of a full length piece is not necessary in some cases. In cases where only a short side form is used, and adequate stiffness is available from the shape of the form, the backbone 20 may be replaced by two short pieces, one at each end, having similar cross section. The cross section as best shown in FIG. 3 is an open rectangle. At the forward end of the side form, a bolt 21 extends upward from the backbone member 20 to a bracket 28 as described hereinafter. At the rear, a slot 22 is provided in the rear bracket 28. A block 23 is slidably engaged within the hollow of the bracket, and a bolt 24 extends through the block and through the slot. Thus the bolt can be moved longitudinally of the slot and therefore of the side form 15. At both ends, the upstanding bolts are similarly fastened. Essentially, an upper and lower channel 26 are provided on the frame members 12 and 13. Sliding carrier means 27 are slidably disposed in these channels to allow movement laterally of the paver. These carriers are formed with a bracket 28 extending outwardly therefrom to provide attachment means for the side forms 15. The bolt 24 extends through an opening in the bracket 28 and nuts 29 are used on both sides of the bracket to hold the form 15 in fixed adjusted position relative to the carrier means and therefore also relative to the paver frame. Again, it will be quite apparent that telescoping tubes or 1111136 like are mechanical equivalents of the slides described a ove.

Adjustment laterally of the paver is accomplished by threadable engagement of the rods 16 in threaded holes in the brackets 28. Thus rotation of the rods 16 will cause the slide carrier to move within channels because of the thread actions. Thus the brackets are actually a follower to respond to the requirements of the threaded rods. Since one end of the side form is carried by a slotted end bracket 20, the fact that one end of the form is moved more than the other is not a problem. The block 23 simply slides within the end bracket to accommodate the need for greater or lesser length between connecting points.

In order to prevent waste of concrete and deposit of concrete where it is not wanted, I provide a removable and adjustable divider wall 30 in the hopper. This wall may be fastened to the hopper in any desired manner. I prefer to use brackets on the wall 30 which are bolted to the hopper in any desired adjusted position, but other fastening means can easily be envisioned.

In use, the utility of my device is obvious for making possible the use of a single paver for varying widths of slab. This can be done either by adjusting both ends of one side form to preserve parallelism or by using one or both side forms in a diagonal position with the discharge set at the proper spacing. However, it is less obvious when used to provide a taper between side forms or when used with side forms at an angle to the axis or direction of normal travel. However, I have discovered that this is very important in the function of paving curves or radii in streets and other slabs. When such curves are being turned, it is normal for the rearward end of the side form on the outside of the curve to be pulled laterally away from the slab when the form is in its normal position. This results in considerable slump or even cavitation in the outer edge of the curve. When this happens, it is necessary to add concrete, and to trowel it into shape, and in effect spoils the usefulness of the paver. By pulling the rearward end of the side form inward toward the center of the curve, I have discovered that this cavitation may be avoided and thus the usefulness of the machine may be preserved for this application.

Having thus described my invention in its embodiment, I am aware that numerous and extensive departures may be made therefrom without departing from the spirit and scope of my invention as limited only by the following claims.

I claim:

1. A slip form paver comprising a hopper, conveyance means adapted to carry said hopper and move it in a forward direction, side forms for mounting on said convey- 4+ ance, a laterally movable carrier member carried by said conveyance above opposite ends of at least one of said forms, means for independently moving said carriers laterally of said conveyance and means for supporting the ends of said form from the respective carriers.

2. The device of claim 1 in which said means for supporting the ends of the forms comprises a vertically adjustable bolt, bracket means connecting said bolts to said carriers, one of said brackets having a slidable connection for movement longitudinally of said forms.

References Cited UNITED STATES PATENTS 1,970,391 8/1934 Nickerson 9446 XR 2,914,995 12/1959 Odell 9446 2,953,977 9/ 1960 Warren 9446 XR 3,098,414 7/1963 Guntert 9446 3,138,079 7/1964 Smith 9446 3,221,618 12/1965 Hudis 9446 3,421,418 1/1969 Hudis 9446 XR JACOB L. NACKENOFF, Primary Examiner 

